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Dodge Dakota (R1). Manual - part 859

Symptom:

P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM

When Monitored and Set Condition:

P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM

When Monitored:

With ignition key on, battery voltage above 10.4 volts, and engine RPM

greater than 400.

Set Condition:

No voltage sensed at the PCM when the ASD relay is energized.

POSSIBLE CAUSES

WIRING HARNESS INTERMITTENT PROBLEM

ASD RELAY OUTPUT CIRCUIT OPEN

FUSED B+ CIRCUIT OPEN

ASD RELAY

PCM

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t, read DTCs.

Is the Good Trip Counter displayed and equal to zero?

All

Yes

→

Go To

→

Go To

Attempt to start the engine.
Did the engine start?

All

Yes

→

Go To

→

Go To

Turn the ignition off.
Remove the ASD relay from the PDC.
Disconnect the PCM harness connector(s).
Measure the resistance of the ASD relay output circuit from the ASD Relay cavity in
PDC to the PCM harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→

Go To

→

Repair the open ASD Relay output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

168

DRIVEABILITY - GAS

TEST

ACTION

APPLICABILITY

All

Yes

→

Go To

→

Repair the open ASD Relay output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

Turn the ignition off.
Remove the ASD relay from the PDC.
Measure the Fused B+ circuit at the ASD Relay connector.
Is the voltage above 10.0 volts?

All

Yes

→

Go To

→

Repair the open fused B+ circuit. Note: Check fuse in the PDC.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

Install a substitute relay for the Auto Shutdown Relay.
Attempt to start the vehicle.
Did the engine start?

All

Yes

→

Replace the ASD Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

→

Test Complete.

At this time, the conditions required to set the DTC are not present.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?

All

Yes

→

Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

→

Test Complete.

169

DRIVEABILITY - GAS

P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM —

Continued

Symptom:

P1391-INTERMITTENT LOSS OF CMP OR CKP

When Monitored and Set Condition:

P1391-INTERMITTENT LOSS OF CMP OR CKP

When Monitored:

Engine running or cranking.

Set Condition:

When the failure counter reaches 20 for 2 consecutive trips.

POSSIBLE CAUSES

CMP SENSOR OUT OF SYNC

DAMAGED TONE WHEEL/FLEX PLATE (CRANKSHAFT)

DAMAGED TONE WHEEL/PULSE RING (CAMSHAFT)

IRREGULAR LAB SCOPE PATTERN OF CMP SIGNAL

INTERMITTENT CKP SIGNAL LOSS WHEN WIRING IS WIGGLED

IRREGULAR LAB SCOPE PATTERN OF CKP SIGNAL

WIRING HARNESS INTERMITTENT

INTERMITTENT CMP SIGNAL LOSS WHEN WIRING IS WIGGLED

SENSOR CONNECTOR/WIRING

CAMSHAFT POSITION SENSOR

CKP SENSOR CONNECTOR/WIRING

CRANKSHAFT POSITION SENSOR

TEST

ACTION

APPLICABILITY

Turn ignition on.
With the DRBIII

t, read DTCs.

Is the DTC Good Trip Counter displayed and equal to zero for P1391?

All

Yes

→

Go To

→

Go To

Warning: When performing the following test, the engine will be running.
Be careful not to stand in line with the fan blades or fan belt. Do not wear
loose clothing.
Start the engine and run until operating temp is reached. (Closed Loop)
With the DRBIII

t under the Misc. menu, choose the 9Set Sync Signal9 function and

observe the

9Actual Sync Setting.9

Does the

9Actual Sync Setting9 read 9In Range9?

All

Yes

→

Go To

→

Loosen the CMP sensor base hold down bolt and turn the base
until the sync is

9IN RANGE9 on the DRBIIIt.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

170

DRIVEABILITY - GAS

TEST

ACTION

APPLICABILITY

Turn ignition off.
With the DRBIII

t lab scope, back probe the CMP signal circuit at the CMP sensor

harness connector using Miller special tool #6801.
Warning: Keep clear of the engine’s moving parts.
Start the engine.
Observe the CMP sensor voltage pattern on the lab scope screen.
Are there any signals missing?

All

Yes

→

Go To

→

Go To

Turn the ignition off.
Visually inspect the related wire harness connectors. Look for broken, bent,
pushed out, or corroded terminals.
Visually inspect the related wiring harness. Look for any chafed, pierced,
pinched, or partially broken wires.
Note: Make sure the Camshaft Position Sensor and/or the Crankshaft
Position Sensor is tight.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?

All

Yes

→

Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

→

Go To

Turn the ignition off.
Disconnect and remove the camshaft position sensor.
Inspect the tone wheel/pulse ring for looseness and/or physical damage.
Is the tone wheel/pulse ring free from defects?

All

Yes

→

Go To

→

Repair/replace tone wheel/pulse ring as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

If there are no possible causes remaining, view repair.

All

Repair

Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

Turn the ignition off.
With the DRBIII

t lab scope, back probe the CKP signal circuit at the CKP sensor

harness connector using Miller special tool #6801.
Warning: Keep clear of the engine’s moving parts.
Start the engine.
Observe the CKP sensor voltage pattern on the lab scope screen.
Are there any signals missing?

All

Yes

→

Go To

→

Go To

171

DRIVEABILITY - GAS

P1391-INTERMITTENT LOSS OF CMP OR CKP —

Continued

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